JPS6185917A - Self-awakening eye examination apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a subjective optometry device, and more particularly to a subjective optometrist that allows an examiner to observe the imaging state of an optometry target image on the fundus of an eye to be examined. .

[Conventional technology]

Conventional ophthalmoscopy devices include so-called objective ophthalmoscopy devices that project a special shape, for example, a slit-shaped split index onto the fundus of the eye being examined, and measure the refractive power of the eye to be examined from the amount of splint on this splint index; having a person observe an optometric target, such as a Landolt ring, through a corrective lens system;
A so-called subjective ophthalmoscopy device is known in which a corrective lens system is adjusted according to the test subject's response until the test subject can properly standardize the optometry target, and the refractive power is measured from this adjustment amount.

On the other hand, although objective ophthalmoscopy apparatuses have the advantage of not requiring a response from the subject, subjective ophthalmoscopy apparatuses are inferior in terms of detecting the optimum correction power for the eye to be examined.

Therefore, recently, in consideration of the troublesomeness and inaccuracy of the test subject's responses, the approximate corrected power is measured using an objective optometry device, and based on this measurement value, a separate or built-in A method of finally determining a more accurate corrected power using a subjective optometry device has been developed.

[Problem that the invention seeks to solve]

In the above-mentioned subjective optometry device, in order to eliminate errors in the test subject's response and perform more accurate B measurements, the subjective optometry device also requires the examiner's ability to examine the examiner's test + 1fJ visual target. Although it is desirable to be able to observe the standard state, that is, the state in which the optometry target image is formed on the fundus of the eye to be examined, conventional devices have not been provided with such a means.

Moreover, even if the examinee is given a questionnaire for subjective optometry, i'Jl
Even if the image formation state of the index method on the fundus of the eye to be examined is observed using a general photoelectric device under tlB, the image of the fundus itself cannot be obtained due to the low reflectance of the fundus and the low conversion efficiency of the photoelectric conversion scene. It was impossible to clearly observe only the target image due to the influence of

Furthermore, in conventional subjective eye examination devices, if the subject cannot clearly observe the visual target no matter how the corrective lens system is adjusted, it is necessary to determine whether there is a defect in the ocular optical system up to the retina, or There was a problem in that it was not possible to determine whether there was a defect in the visual nervous system beyond the retina.

The present invention has been made in view of the above-mentioned problems of conventional optometry devices, and its purpose is to provide a self-conscious method that allows the examiner to observe the imaging state of an optometry target image in the fundus of the examinee's eye. An object of the present invention is to provide an optometry device.

Another object of the present invention is to observe the imaging state of the optotype image,
It is an object of the present invention to provide a subjective ophthalmoscopy device capable of clearly and accurately displaying only a target image while excluding the fundus image of the eye to be examined.

Still another object of the present invention is to determine whether there is a defect in the optical system of the eye up to the retina or in the visual nervous system after the retina when the subject cannot clearly observe the visual target. Our goal is to provide a self-conscious optometry device that makes it possible.

(Means for solving the problems) The present invention (11 below to solve the above problems)
It has the characteristics of growth. That is, the present invention
The optometry optotype image is formed at the 1゛Yo-style test UU = position where the optometry optotype image is formed through the corrective lens system that can convert the refractive power to the lens system for optometry.
Conclusion 1 for forming a moxibustion eye fundus image on an imaging device! The subject 111 (
The image processing unit removes the fundus image signal and extracts the optometry target image No. 13, and the image includes a display means for displaying the optometry target image from the output of the processing unit. be done.

Further, an embodiment of the present invention provides an optometry target (;K (,T
,, 4E is multiplied by the transfer function of the visual nervous system.

〔Example〕

Hereinafter, the self-aware eye device according to the embodiment of the present invention will be explained. The subjective optometry device includes a visual test (slip presentation device 2) that presents a predetermined optometry target 1 made by the examiner 1.3 times;
Arranged on the current vehicle light 1IIJI3 of the optotype presentation device 2:! :”I
'.

and a corrective lens system 4 that corrects the refractive power of the eye to be examined, and the eye E is connected to the reference optical axis 3 between the optotype presentation device 2 and the corrective lens system 4 through the corrective lens system 4. A half mirror 6 is obliquely installed above, and an objective lens IO and an image pickup tube 12 are provided on the imaging optical axis 8 which is the reflection optical axis of the half mirror 6, and the fundus ER and the light receiving surface 14 of the image pickup tube 12 are provided. are arranged to be conjugate with respect to the objective lens 10.

The output of the image pickup tube 12 is sent to the ink face 1 of the image processing section 16.
8 is input. The image processing unit 16 includes an ink face 1
8, a fundus image memory 20a, an image memory 20b, and an arithmetic circuit 22 connected to the interface 18. The fundus image memory 2oa is a memory for storing the fundus image when the fundus is illuminated with uniform light before standardizing the optotype. This is a memory for storing the imaged fundus image, and the arithmetic circuit 22 is for performing the following arithmetic processing on the image signal of the fundus image.

As the first calculation process, as shown in FIG. The fundus image signal C2o (x, y) of only the '61 target image is extracted by removing the fundus image signal.
If the brightness of the fundus image itself differs between when the optotype is set as a standard and when the fundus is illuminated with uniform light, the fundus image signal can be multiplied by a coefficient corresponding to the fundus illumination light intensity condition. good.

Next, as a second calculation process, visual; Munakata video signal o
(X, y) is convolved with the point spread intensity distribution k(x, y) due only to the visual nervous system of a normal person.

In other words, humans do not directly recognize the optotype image itself formed at the control position of the fundus of the subject's eye. In other words, the target image itself formed on ft1l 112 is not recognized by the subject, and as shown in FIG. An object image with a luminance distribution of 01 (x, y) *
It is recognized by the examiner as an object with a luminance distribution of T (x, y) expressed by k (x, Y) (*: convolution).

The ink face 18 further includes a test subject response switch 24 for the test subject to respond to the standard state of the optotype, a corrective lens adjustment system 26 for adjusting the corrective lens system 4, and a corrective lens adjustment system 26 for adjusting the corrective lens system 4. Monitor TV2 that displays the status of the visual target
8 is connected to an operation panel 30 for the examiner to operate the apparatus.

Next, g-eye measurement using the subjective optometry device having the above configuration will be explained. First, the examiner uniformly illuminates the fundus of the eye to be examined using the optotype presentation device 2 or a fundus illumination system (not shown), and controls the corrective lens adjustment system 26 as appropriate using the lumber making board 30. The optometric fundus image is captured in the imaging tube 12.
An image is formed on the light-receiving surface 14 of. The video signal of the fundus image, which does not include the optotype image, is input to the fundus image memo IJ+2Qa4 via the ink face 18 and arranged.

Next, the examiner operates the operation panel 30 to present the optometry target l using the optotype presentation device 2, and causes the subject to gaze at it. A video signal of the fundus image including the optotype image, which may not yet be in focus at this point, is input to the image processing unit 16.
The arithmetic circuit 224 converts the signal into a video signal of only the visual target image and outputs it to the monitor TV 28, which displays it.

The examiner looks at the optotype image displayed on the monitor TV 28 and determines whether this is the optimal focused state. # Control the 'ζ correction lens system 26 via the machining plate 30. The refractive power of the eye to be examined is determined from the amount of correction of the corrective lens system 26 at this time. If the subject does not recognize that the optotype image displayed on the monitor TV 28 is in the optimal focused state, the subject's It is determined that there is an abnormality in the visual nervous system.

Note that t7. of the above-mentioned visual nervous system only. i+j4
+,'・U degree distribution k (x, y) cannot be directly determined by experiment, but it can be determined by experiment using the above formula.III f! Point spread intensity distribution of optical system only
When (x, y), j (x, y) *
Since k (x, y) (*: convolution) can be obtained through psychophysical experiments, k (x, y) can be calculated based on this.

In the above embodiment, the examiner performed the eye examination by scratching the operation panel 30 according to the subjective eye examination procedure.
It is also possible to automatically perform eye examination by accumulating this value in the arithmetic circuit 22.

Furthermore, in the above embodiment, the visual target image signal was multiplied by the point spread intensity distribution of only the visual nervous system of a normal person, but instead of this, the visual By multiplying by the transfer function of the nervous system, it is possible to find out how the person with the particular abnormality ultimately recognizes the visual target.

〔Effect of the invention〕

In the present invention, as described above, in the subjective ophthalmoscopy device, the optometry target image of the fundus of the eye to be examined is extracted from the fundus image and displayed.
The present invention has a 91J effect that allows accurate measurements to be made by eliminating errors in the examiner's responses. By having the function F1, which multiplies the point spread intensity distribution of only the phantom visual nervous system, it is possible to distinguish and detect defects in the retina of the subject's eye and defects in the visual nervous system after the retina. has.

[Brief explanation of the drawing]

FIG. 1 is a 114-dimensional explanatory diagram of an embodiment of the present invention, FIG. 2 is an explanatory diagram of the principle of image processing of the present invention, and No. 3121 is a graph illustrating the principle of image processing of the present invention. 1... 1 as an optotype for the eye 2... optotype presentation device 4... lens system for orthodontics 6... half mirror 10... female, 1 'l lens 12... imaging Tube 16...Image processing section 18...Ink face 20a...Fundus image memory 20b...Image memory 22...Arithmetic circuit

Claims (4)

[Claims] (1) In a subjective ophthalmoscopy device in which the subject is allowed to standardize the optometry target through a corrective lens system that can convert the refractive power, an image of the fundus of the subject's eye in which the optometry target image is formed is captured. an imaging optical system for forming an image on the device; removing a fundus image signal of the examined eye from the image signal from the imaging device;
A self-aware optometry device comprising: an image processing unit that extracts an optometry target image signal; and a display unit that displays an optometry target image from the output of the image processing unit. (2) The subjective optometry device according to claim 1, wherein the image processing unit has a convolution image processing function for converting the point spread intensity distribution of the visual nervous system to the optometry target image signal. (3) The subjective optometry device according to claim 2, wherein the point spread intensity distribution of the visual nervous system is a transfer function of a normal person. (4) The subjective optometry device according to claim 2, wherein the point spread intensity distribution of the visual nervous system is different from the transfer function of a normal person.